116 



ORCHIDACEAE. 



1. Dipodium. 



Leaf solitary, more or less hairy (except in Caladenia 

 Menziesii). 



Calli on surface of labellum Caladenia 13. 



No calli on surface of labellum, but large double-headed 



appendage at base Glossodia 14. 



Leaves more than one. 

 Labellum 3-lobed. 



Petals well-developed, stalked, spreading or recurved... Diurts 15. 



Petals minute, not stalked, incurved over column Orthoceras 10. 



Labellum without lateral lobes. 



Flowers small, pink or white, arranged spirally in a 



spike Spira^thes 17. 



Flowers large, reversed Cryptostylis 18. 



Flowers green or greenish, generally large, dorsal sepal 



and lateral petals united to form a hood Pterostylis 19. 



Note. — The letters N.P. among the locality names denote the National Park, Belair. 



1. DIPODIUM, R. Br. 



(Greek : dis, double ; podion, a little foot : in reference to the 2 stalks, or false -caudicles, 



of the pollinary apparatus.) 



Perianth-segments free, nearly equal, spreading. Labellum sessile, erect, 3-lobed ; 

 lateral lobes much shorter than middle one : lamina with a hairy track in middle line. 

 Column erect, semi-cylindrical. Anther terminal, lid-like, deciduous. Pollen-masses 2, 

 waxy, bilobed, attached when mature to the rostellum by a large disk and double stipes 

 produced backwards from the latter. Terrestrial herbs, glabrous, with imbricated 

 sheaths at base of the scape, the upper 

 ones passing into more distant bracts. 

 Flowers spotted. 



A small genus including about 9 mem- 

 bers. 2 of which are endemic to Australia. 

 Others are reported from New Guinea, 

 New Hebrides, Philippines, and Malayan 

 Archipelago. 



1. D. punctatum (spotted), R. Br. Text- 

 fig. 31. A. • A leafless fleshy plant, 30-75 

 cm. high ; with an extensive system of 

 thick elongated tuberous roots. Flowers 

 often numerous, large, pink or whitish, 

 spotted, in a loose raceme. Perianth 

 segments free, similar, oblong-lanceolate, 

 recurved or spreading ; sepals about 17 

 mm. long, the petals rather shorter. 

 Labellum sessile, erect, about 13 mm. 

 long ; 3-lobed ; the lateral lobes much 

 shorter than the middle one ; lamina 

 with 2 short raised lines from a little 

 below the centre, uniting to form a hairy 

 keel ending in a woolly patch near the apex. 

 Column about half as long .as labellum. 

 Anther hemispherical, lid-like, 2-celled. 

 Pollinia 2, bilobed, waxy, attached to a 

 double stipes of the viscid disk. Stigma 

 deeply excavated, transversely oval, just 

 below the rostellum. 



N.P. ; higher levels of Mount Lofty Text figure 31.— A. Dipodium punctatum, 



Range ; Mount Muirhead, near Millicent ; showing root-system, base of stem with over- 



„i tt> „+~™ Q +nfo c on^ T, om omn t„„ lapping scales and in florescence . B. Calochilus 



also Eastern States and Tasmania. Jan.- cupreus, showing leaf, portion of stem, and 



Apl. inflorescence. All parts much reduced. 



2. CALOCHILUS, R. Br. 



(Greek kalos, beautiful ; kheilos, a lip.) 

 Perianth-segments free. Dorsal sepal broad, erect, hood-like ; lateral sepals broad , 

 acute, more or less spreading. Petals shorter than the sepals, wide, erect or incurved. 

 Labellum exceeding the other segments in length, sessile, undivided, with an oblong 

 base and triangular lamina, the latter densely bearded with purple or metallic-colored 

 hairs. Column short and broad, its wide wings produced behind but not beyond the 

 anther. Anther terminal, incumbent or horizontal, with a blunt beak, 2-celled. Pollinia 

 4, or 2 each deeply bilobed, granular, unconnected with the rostellum. Terrestrial 



